defensible

1able to be supported by reasons or arguments that show that it is right or should be allowedIs abortion morally defensible?Is it morally defensible to deny legal advice to a prisoner?There is no defensible basis for this argument.oppositeindefensible

2(of a place)able to be defended from an attack

Word OriginMiddle English (in the sense ‘capable of giving protective defence’): from late Latindefensibilis, from Latindefendere, from de-